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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1c5d02dc0198aeccf719fc0405b846fdabc9fd4107239b2f797421632019831' 
  AND token = '5Y8lXinpvGk5iAJFnrVRUingr+Owl0gex7R9/LI9U0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}